While the babies are singing in the Reptar wagon in the river, Phil and Lil switch places between shots

After finding the kids, Stu and Didi hug, and there is a sound of Tommy's "sponsitility" dropping on the ground. However, Tommy is still wearing it in the next shot

The propellers falls off of Stu's "Dactar" in one shot, but reappear later fixed back on when he finds the babies.

Spike's collar reappears in multiple shots, even though it was ripped off by the wolf

In the Rangers' station, the tuning dial on the radio disappears and then re-appears

After Tommy falls into the mud, his clothes alternate between being muddy and clean.

At the end the movie, when the parents find them, we see the cars' headlights shine light on the babies' backs; they turn around, but the lights are coming from the wrong direction (when they see Stu and Spike under the bridge, the babies are facing the ranger station, where the cars pull up to, indicating the light should have been in their faces, not at their backs).

In the original 65 episodes, the Rugrats say "diaper". In the Rugrats Movie and episodes made after the movie, they say "diapie".