The professor at the end of the last episode of season 10 states he would reset time to before he made the time button, however, in the beginning of the episode they get reset to where they were frozen in time at the conclusion of season 10.
Slurms Mckenzie is shown on a Slurm Zero ad as incredibly old and wrinkly. This contradicts Fry And The Slurm Factory because he dies in it.
When Bender flips through the channels to watch they can see Star Trek: The Original Reboot on channel 219. In S4 E12 Fry learns that Star Trek was banned after the Star Trek Wars.