Continuity mistake: When April is running with the canister, she has it in her right hand. The part where she has to put her hands on the car, you see it go from her right hand immediately to her left hand in the next shot.
Teenage Mutant Ninja Turtles: Out of the Shadows (2016)
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Directed by: Dave Green
Starring: Laura Linney, Will Arnett, Megan Fox, Alan Ritchson, Stephen Amell
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More mistakes in Teenage Mutant Ninja Turtles: Out of the Shadows
Raphael: Every minute we stay down here, Shredder gets stronger and Mikey gets more annoying.
Donatello: We're training... sort of. As soon as the sun goes down, it's Turtle time.
Trivia: When Jones is asking for Bebop and Rocksteady at the bar, the jukebox plays "Ice Ice Baby" by Vanilla Ice, he made a cameo in one of the previous TMNT films.
Answer: There have been many reasons they maybe didn't want to come back for a sequel. Or sometimes actors are too busy working on another movie and it interferes with their filming schedule.