Really weird...

Before I started experiencing the crash and lag issue with the launcher (I have submitted) I was playing in 1.7.4 (can't list in affected versions) as my fave server wasn't updated to 1.7.9 so I went on single player (server was down) and I was a villager, zombies looked like villagers with zombie eyes, endermen looked like tall villagers with purple eyes and picked up blocks and attacked me and other mobs etc. this was really annoying!! D: after this I was too confused to do anything so I switched to 1.7.9 and I was a villager but mobs were back to normal, not sure if it is still like this because of my other issue I have posted in minecraft launcher bug tracker. Please help with both!! my friend has same system as me I think and she doesn't get it