This may sound odd, but a friend recently asked me (guess its his thing) and I did watch a lot of TMNT as a kid. I personally can only think of two times.
1. The one with the robot cop, April is not wearing the boots as she is on the phone (I think her apartment was robbed or something)
2. Of course, the infamous tickle torture scene with Don Torteli (dont remember the episode cause he does it a lot, right?)
Any other times in which is she in barefeet? Thanks and forgive the weirdness