See attached video. At the end, I green circle the nearby torches. The building where the first skeleton and spider spawn has 2 torches under the roof overhang, so aren't visible from this aerial view.

I was revamping this "abandoned village" into my base. Half way through adding buttons to the roofs to "spawn proof" the town, I realized zombies and other mobs spawn nightly right by torches, seemingly ignoring light levels.

I witnessed a cluster of zombies (like the group of 3 seen in this video) also spawning in 2 other locations in town on different nights, within 4 blocks of a torch.