Question: What happened to Mike the Mouse? At the end of the film we see him escaping with his girlfriend, but the bear is latching on the car. This is the last time we see them and we don't see them at the reopening of the theatre, so what happened?
Answer: Mike had to stay with the bears for the rest of his life.
Question: In the trailer it shows a pig singing "Bad Romance" by Lady Gaga but this song is not on the soundtrack. Why is that? Also "Anaconda" on the soundtrack is "Oh.My.Gosh" instead of its proper title. Again, why is that? It doesn't make sense for one song to be in the movie but not on the soundtrack and for another song to not have its proper title.
Answer: It would have to do with paying royalties to the artists if the songs were included on the soundtrack album. The artists would be paid a one-time flat fee for their songs to be used in the movies or the trailers, but for albums being sold would mean some of the profits would have go to the artists. The movie studio can make just as much on the soundtrack album without certain songs being included. Regarding the title, it may be the artist wanted it changed for some reason, or the filmmakers felt it didn't fit in.
Answer: I think he escaped from the bear with his girlfriend, sped off very fast and the bears fell off the car.
You haven't read the question. Before it cuts to Meena's performance, the lead bear popped up from behind the car and presumably kidnapped them.