While flying in creative mode I noticed that mobs will randomly appear slightly transparent when looking at them from certain random angles or locations.

Here is my forced crash report while the mobs were clear: ---- Minecraft Crash Report ----
// Hey, that tickles! Hehehe!

Time: 11/18/15 5:36 PM
Description: Manually triggered debug crash

java.lang.Throwable
at bbz.aw(SourceFile:1672)
at bbz.s(SourceFile:1593)
at bbz.as(SourceFile:941)
at bbz.a(SourceFile:385)
at net.minecraft.client.main.Main.main(SourceFile:122)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

– Head –
Stacktrace:
at bbz.aw(SourceFile:1672)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bmf['Brandon54321'/21179, l='MpServer', x=149.75, y=71.03, z=-210.50]]
Chunk stats: MultiplayerChunkCache: 287, 287
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (60,64,248), Chunk: (at 12,4,8 in 3,15; contains blocks 48,0,240 to 63,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 9972 game time, 15358 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 83 total; [vz['Rabbit'/36892, l='MpServer', x=104.50, y=63.00, z=-233.50], vz['Rabbit'/36893, l='MpServer', x=104.44, y=64.00, z=-232.50], vz['Rabbit'/36894, l='MpServer', x=102.97, y=64.00, z=-229.66], vz['Rabbit'/36895, l='MpServer', x=174.50, y=72.00, z=-237.50], yo['Enderman'/36896, l='MpServer', x=172.25, y=65.00, z=-225.53], yn['Creeper'/36897, l='MpServer', x=163.56, y=65.00, z=-236.19], vq['Bat'/36898, l='MpServer', x=174.03, y=46.28, z=-226.72], vz['Rabbit'/36899, l='MpServer', x=174.31, y=72.00, z=-234.53], vz['Rabbit'/36900, l='MpServer', x=181.47, y=77.00, z=-230.75], vz['Rabbit'/36913, l='MpServer', x=110.50, y=63.00, z=-254.50], yn['Creeper'/36914, l='MpServer', x=191.50, y=23.00, z=-244.50], yn['Creeper'/36915, l='MpServer', x=191.50, y=23.00, z=-245.50], zb['Skeleton'/36916, l='MpServer', x=190.50, y=23.00, z=-244.50], yn['Creeper'/36917, l='MpServer', x=192.50, y=23.00, z=-246.50], vz['Rabbit'/36931, l='MpServer', x=113.50, y=64.00, z=-256.50], zb['Skeleton'/36932, l='MpServer', x=131.50, y=40.00, z=-261.50], yo['Enderman'/36933, l='MpServer', x=132.50, y=40.00, z=-265.50], yo['Enderman'/36934, l='MpServer', x=125.75, y=39.00, z=-263.50], vq['Bat'/36935, l='MpServer', x=183.48, y=40.35, z=-253.55], yn['Creeper'/36944, l='MpServer', x=120.50, y=64.00, z=-167.50], yo['Enderman'/36945, l='MpServer', x=126.50, y=64.00, z=-160.50], zb['Skeleton'/36950, l='MpServer', x=115.50, y=64.00, z=-167.50], zb['Skeleton'/36952, l='MpServer', x=113.50, y=64.00, z=-171.50], zf['Zombie'/36981, l='MpServer', x=174.50, y=24.00, z=-252.50], zf['Zombie'/36982, l='MpServer', x=177.47, y=26.00, z=-244.84], zf['Zombie'/36984, l='MpServer', x=167.50, y=24.00, z=-247.50], vz['Rabbit'/36987, l='MpServer', x=210.38, y=68.00, z=-272.59], vz['Rabbit'/36988, l='MpServer', x=206.28, y=66.00, z=-278.50], vz['Rabbit'/36989, l='MpServer', x=205.50, y=68.00, z=-274.50], zb['Skeleton'/36992, l='MpServer', x=177.50, y=18.00, z=-255.50], zb['Skeleton'/36995, l='MpServer', x=135.50, y=21.00, z=-256.50], zb['Skeleton'/36996, l='MpServer', x=137.50, y=21.00, z=-258.50], zf['Zombie'/37001, l='MpServer', x=122.50, y=67.00, z=-238.25], zd['Spider'/37004, l='MpServer', x=123.50, y=69.00, z=-245.50], yn['Creeper'/37005, l='MpServer', x=212.50, y=43.00, z=-182.50], yn['Creeper'/37006, l='MpServer', x=214.66, y=42.00, z=-181.50], vq['Bat'/37069, l='MpServer', x=170.50, y=57.22, z=-187.97], vq['Bat'/37070, l='MpServer', x=169.53, y=58.72, z=-184.19], vq['Bat'/37093, l='MpServer', x=187.25, y=42.03, z=-258.48], vq['Bat'/37094, l='MpServer', x=173.25, y=49.10, z=-268.75], zf['Zombie'/37179, l='MpServer', x=116.72, y=63.00, z=-204.25], zf['Zombie'/37181, l='MpServer', x=125.50, y=63.00, z=-193.50], zb['Skeleton'/37188, l='MpServer', x=207.50, y=64.00, z=-186.50], zb['Skeleton'/37189, l='MpServer', x=214.28, y=64.00, z=-177.75], zb['Skeleton'/37193, l='MpServer', x=208.50, y=64.00, z=-196.50], vq['Bat'/37318, l='MpServer', x=98.53, y=31.85, z=-210.53], vq['Bat'/37320, l='MpServer', x=168.55, y=32.07, z=-284.30], vq['Bat'/37321, l='MpServer', x=159.26, y=30.88, z=-289.60], zb['Skeleton'/33268, l='MpServer', x=222.50, y=57.00, z=-167.50], vq['Bat'/37431, l='MpServer', x=195.31, y=34.41, z=-161.59], vq['Bat'/37452, l='MpServer', x=132.50, y=54.75, z=-178.69], vz['Rabbit'/31345, l='MpServer', x=101.69, y=64.00, z=-162.03], vz['Rabbit'/31346, l='MpServer', x=109.88, y=63.00, z=-158.38], wc['Squid'/37490, l='MpServer', x=112.59, y=56.19, z=-275.41], wc['Squid'/37503, l='MpServer', x=98.63, y=58.34, z=-192.34], wc['Squid'/37504, l='MpServer', x=88.69, y=58.13, z=-202.41], wc['Squid'/37505, l='MpServer', x=88.06, y=56.00, z=-203.56], wc['Squid'/37506, l='MpServer', x=102.19, y=59.00, z=-196.66], bmf['Brandon54321'/21179, l='MpServer', x=149.75, y=71.03, z=-210.50], zb['Skeleton'/33681, l='MpServer', x=165.19, y=58.00, z=-196.53], zf['Zombie'/35825, l='MpServer', x=175.50, y=27.00, z=-182.50], zf['Zombie'/35862, l='MpServer', x=184.50, y=38.00, z=-162.50], yn['Creeper'/35997, l='MpServer', x=163.53, y=66.00, z=-141.09], yn['Creeper'/36002, l='MpServer', x=144.81, y=65.00, z=-134.44], vz['Rabbit'/29973, l='MpServer', x=205.19, y=65.00, z=-144.75], vz['Rabbit'/29974, l='MpServer', x=152.47, y=69.00, z=-165.50], vz['Rabbit'/30004, l='MpServer', x=141.88, y=66.00, z=-150.69], vz['Rabbit'/30005, l='MpServer', x=172.31, y=69.00, z=-173.19], vz['Rabbit'/30007, l='MpServer', x=151.41, y=69.00, z=-165.59], vz['Rabbit'/30008, l='MpServer', x=175.47, y=70.00, z=-173.53], vz['Rabbit'/30009, l='MpServer', x=142.34, y=67.00, z=-167.50], vz['Rabbit'/30010, l='MpServer', x=172.56, y=69.00, z=-176.00], vz['Rabbit'/30011, l='MpServer', x=172.28, y=69.00, z=-172.50], vz['Rabbit'/30012, l='MpServer', x=151.22, y=69.00, z=-165.06], yn['Creeper'/34191, l='MpServer', x=204.50, y=46.00, z=-191.50], zb['Skeleton'/36312, l='MpServer', x=182.50, y=49.00, z=-201.50], yn['Creeper'/36314, l='MpServer', x=173.44, y=70.00, z=-160.09], zb['Skeleton'/36315, l='MpServer', x=165.25, y=69.00, z=-157.50], zd['Spider'/30211, l='MpServer', x=132.75, y=64.00, z=-142.44], vz['Rabbit'/32367, l='MpServer', x=181.47, y=68.00, z=-185.31], vz['Rabbit'/32368, l='MpServer', x=186.72, y=68.00, z=-179.38], vz['Rabbit'/32369, l='MpServer', x=184.50, y=67.00, z=-203.91], zd['Spider'/36586, l='MpServer', x=181.50, y=68.00, z=-155.50]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Integrated singleplayer server
Stacktrace:
at bkg.a(SourceFile:363)
at bbz.b(SourceFile:2493)
at bbz.a(SourceFile:394)
at net.minecraft.client.main.Main.main(SourceFile:122)

– System Details –
Details:
Minecraft Version: 15w47a
Operating System: Windows 8.1 (amd64) version 6.3
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 157612592 bytes (150 MB) / 373919744 bytes (356 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
Launched Version: 15w47a
LWJGL: 2.9.4
OpenGL: Intel(R) HD Graphics 2500 GL version 4.0.0 - Build 10.18.10.3621, Intel
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

Using VBOs: No
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs:
Current Language: English (US)
Profiler Position: N/A (disabled)
CPU: 4x Intel(R) Core(TM) i5-3330 CPU @ 3.00GHz