When one of the Murderflies is pounding her fists together, her wings are still flapping even though her arms aren't attached.
The killer opponents rips Amy and Leela's wings halfway down, but when the killers fly away with Fry, we can see Amy and Leela's wings are not ripped at all.
The bottoms of Amy and Leela's battle outfits disappear for a second when they are hit by the reptiles' tongues in the air.