People at IGN saw footage of the movie and it all sounds strange and bad. I'm going to highlight some parts that stuck out to me but there are more in the full article.
We see Sonic’s POV as he races down the road and through the woods. We hear him say “Gotta go fast” as Coolio’s “Gangsta’s Paradise” plays. Tom finally catches Sonic as the latter is hiding inside a shed. Sonic just says, “Uhhh, meow?”
I know Sonic and gangstar's paradise were created in the same decade but it just sounds strange put together. This scene sounds like something the internet put together for a video long forgotten on youtube.
[Dr. Robotnik] arrives on a hi-tech chopper, flanked by a suck-up assistant. Robotnik (played by Jim Carrey) quickly puts a uniformed major (played by Neal McDonough) in his place, and then we see Robotnik greeting Tom at his home (“Good morning, my rural chum.”). The two then have an exchange where Robotnik says Tom was bottle-fed but he replies that he was breastfed actually. “Nice,” replies Robotnik. “Rub that in my orphaned face.”
C+C Music Factory;s “Everybody Dance Now” plays over a series of shots of Robotnik, with Jim Carrey doing his slapstick routine. Robotnik gets a latte from his assistant, roughs him up a bit, but the assistant is clearly in awe of him.
I don't even know what is going on in this scene. It's really weird to include a joke about breastmilk in what I think is essentially a children's movie. Then again, I guess if children's movies can get away with poop and fart jokes, I guess breastmilk jokes are fair game.
Other than that, everything else seems par for the course. You hire Nick Cage if you want full Cage and you want Jim Carrey when you want full jim Carrey. The scene still sounds worn out and dumb regardless.