My theorys on how to create the glitches (I don't have access to the game for a couple days):
Hawk Girl has certain moves that cause the camera to move down. I forget which move it was but its just a normal that causes the camera to pan down for some reason and I thought that was really distracting. If you're in the corner and an interactable is used then interupted by a move that causes the camera to pan down it creates the glitch. I THINK...
Same situation happened on the cell block stage. Interactable was in the start up frames of being used and I interupted it with deathstrokes db3 (spin). The freezer dropped and stuck around as a foreground object completely blocking game play.
I remember in the beta there were instances where you could use the vent as wonder woman (power character), interupt it with batman during the start up frames and the vent would disappear. However if wonder woman used the interact button on the vent she would pick up one invisible vent and throw it anyway.
Don't know if any of this will be helpful in identifying the bugs, just stuff I'm trying to recall to hopefully figure things out.