Mobs can spawn on slimeblocks.

When you have a crossbow on the off-hand it doesn't appear on your off-hand.

When standing in soul fire. The fire on my screen is red not blue.

When i was in my trading hall, I noticed the prices increased on my zombie converted villagers, so the prices went up. For example, it costed 31 emeralds for a Protection IV book instead of normally like 13 emeralds or so.