Other mistake: Fry got the tattoo while he was in the cryogenic device. Yet Fry has never had that tattoo until it was pointed out.
Suggested correction: No, but it's the same with many things in cartoons like this in that things don't roll over to following episodes or vice versa. Example. Kenny gets killed in most South Park episodes upto about S7. But he's always in the next episode.
Plot hole: When Nudar first uses the time sphere, he has to say "Yesterday" to go back in time. Yet whenever Bender goes back in time, he doesn't have to say anything.
Suggested correction: If you notice when Nudar was in the time sphere, time around the sphere seemed to slow down, so Bender could have just been faster than everyone else as he was stating the time he wanted to go to.
