As Terra is confronting Slade about betraying her, he takes off his mask. In the next shot, in which the perspective is from behind him, he's got his mask back on. In the next, it's off again.
When the Titans are driving down the road at the start of the movie Robin says he's driving slowly to follow the flow of the traffic & there is one car slightly in front of them in the other lane. After Flash checks the fight he tells them to have a look so the car accelerates but there are no vehicles in front of them. They can't have been following the flow with no-one ahead of them.