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: During the Gotham chase, a group of kids get off the school bus, cross the street, and stand in the middle of the road. When Batman launches the puncture spikes, they get off the bus again.
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 Flash sees his mum shopping, she is holding a cereal box. From the angle shot from behind, the box is gone.
Continuity mistake: Old Barry replies to his dad that "school is good, school is great," and gestures raising his right hand. From a side shot, it's lowered. Then back to a front shot, and he is lowering his hand.
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 the group enters the Siberian elevator, Kara's arm is bent. A shot later, it hangs down her side.
Continuity mistake: When the Barrys, Kara, and Bruce exit the Siberian lab, they encounter an employee. At first, the top of his hat is wrinkled. A shot later, it's stretched upwards. This swaps back and forth.
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.
