In the skit with the three wrestlers, one of the wrestlers punch Jim Carrey in the mouth and some of his blood goes on the couch. It stays there for a while and then, as Jim, now bleeding from the mouth, leaves, the blood has completely disappeared.
During the "Justice Legions of America" skit, Carrey mistakenly says "Justice League of America" at one point late in his speech. The Justice League was obviously the copyrighted intellectual property on which the Justice Legion was based.