Continuity mistake: In the Soviet bunker, Batman hooks a soldier taking cover at a distance. In the next shot he's suddenly closer and in range to kick him.
Continuity mistake: When Old Barry shows Young Barry how the ring works, his grip changes between shots, with his thumb covering the hole or not.
Continuity mistake: The way Young Barry holds the broccoli when feeding Old Barry changes between instant cuts.
Continuity mistake: Young Barry grabs the peanut butter and a spoon. Shot changes and now he has a broccoli in his hand, and the spoon is nowhere to be seen. After Old Barry eats the broccoli, we don't see Young's hand for a mere two seconds, and now the broccoli has vanished, and he holds the spoon instead.
Continuity mistake: When Young Barry dies, Old's hand and arm are covered in blood. Old stands up and suits up, and now his hand and arm are clean.
Continuity mistake: When Old Barry faces Dark Flash, Young Barry stands on the left side of the screen. Old Barry then turns to the right and cries, "Get out of here, Barry." But he's facing the wrong way.
Continuity mistake: When Old Barry is about to fight Dark Flash, Young Barry suddenly appears and Old Barry turns his head to our left and stares at him. However, a mere frame later, he is facing ahead. If you watch closely, his head is turning the opposite way, from right to left. (02:01:13)
Continuity mistake: During the trial, after the lawyer proves Barry's father's innocence, the way father and son grab hands changes between shots.
Continuity mistake: Flash arrives in the past and lands next to the kerb, where he leans on to help him stand up. A shot later, he is several metres away, near the middle of the road.
Continuity mistake: When Kara wakes up in Bruce's mansion and meets the Barrys, the way the shroud on the table folds changes between shots.
Continuity mistake: When Young Barry is carrying Kara in his arm, the strands of hair over her cheek differ between the wide angles and the close-up.
Continuity mistake: Aquaman raises his right arm and says, "I'm the same guy," and points at his chest. A shot later, his arm is suddenly lowered.
Continuity mistake: Aquaman's scarf slides from his shoulder down to his arm. A shot later, it's back over his shoulder. It changes positions several times between shots.
Continuity mistake: When Barry talks to Aquaman about the Batman actors, one can see the top of the bottle he holds. A shot later, it's covered in paper.
Continuity mistake: When Barry grabs the bottle from Aquaman, he holds it from the upper part. A shot later, his grip is lower.
Continuity mistake: When Barry exits the bar with Aquaman, he grabs the flask with his left hand. A shot later, it's in his right hand.
Continuity mistake: At Young Barry's apartment, when the group talks about BTTF, Patty scratches her chest, but from a new angle, her arm is extended.
Continuity mistake: After Young Barry removes the underwear off Old Barry's head, his hair is pointing upwards. A shot later, it's brushed.
Continuity mistake: In Siberia, Batman kicks and knocks out a guard against a column. The position of his body and legs differ between the close-up and the aerial angle a shot later.
Continuity mistake: A sniper pops out of the hatch in the truck right when Batman knocks him, which makes him fall backwards. A shot later, the sniper is suddenly upright again.
