Michelangelo: What's up, brah? Oh, you think you can handle this, Huh? I'm a snapping turtle fool!
When April O'Neil calls Vernon Fenwick (drives the channel 6 van), he answers his phone and immediately says "O'Neil". When the scene cuts back to O'Neil, we see she called from a payphone. Fenwick would have no way to know it was her calling.
During the movie, The Shredder says "Tonight I dine on Turtle Soup", a reference to the TMNT Arcade game and the original 1980s cartoon series.