Question: Does anybody know how soon this movie takes place after the first one? The foot soldiers are regrouping at the "fallback spot" and Shredder digs out of the garbage pile which would suggest anywhere from 2-24 hours later. Yet somehow April has a brand-new fully furnished apartment and it sounds like the turtles have been there for weeks by the manner in which the neighbor complains about the noise.
Phixius
Answer: Maybe they went into hiding for a while before meeting at the junkyard. It's unlikely they'd be remembering where to go after a huge battle from the previous TMNT movie. It was hectic after all.
Answer: Shredder could have been unconscious for days before he even began to dig his way out. Also, some apartments come furnished. The neighbor is likely one of those neighbors that always has to complain about something, and exaggerate at that. It's probably been about a week or so.
Phixius ★
That still doesn't explain the scene with the foot clan.