can you spot an incorrect part?

  Just for all who enjoy having fun with riddles. Try to find mistakes in the following sentences :)

1   They are very careful about their appearance because although they love laughing at others, they can’t stand it if anyone laughs at them.

2     A snow leopard is a big cat, related to lions and tigers. However, it is much smaller as a tiger.

3     I hate not being able to speak any foreign languages.