Character mistake: One of the top most taboo things for a super hero to do is reveal any aspect of another hero's identity to someone, especially a villain. But when Flash is trapped by the gray adhesive and the other Justice League members are about to take the villains away to disarm the bombs, Flash tells Green Lantern "Hal, go", calling Green Lantern by his first name right in front of Mirror Master. (00:08:05)

Justice League: The Flashpoint Paradox (2013)
1 character mistake - chronological order
Directed by: Jay Oliva
Starring: Ron Perlman, Cary Elwes, C. Thomas Howell, Nathan Fillion, Michael B. Jordan, Kevin McKidd, Justin Chambers, Vanessa Marshall, Jennifer Hale
Continuity mistake: After catching the rocket and saving Cyborg and Batman from it, Superman turns and drops the exploded rocket and begins lifting into the air. It cuts to a wide angle as Superman is hovering above the ground, and the rocket he just dropped is nowhere to be seen. (00:52:05)
The Flash: It's me you want, Thawne. You don't have to kill thousands of innocents to bring me down.
Eobard Thawne: No. No, I don't. But I choose to, knowing it will make your last moments pure agony. Goodbye.
Trivia: After the ending credits, there is an additional scene showing an alien invasion appear from a temporal rift. This is likely an homage to the upcoming movie, Justice League: War, which is the story of the Justice League first forming in order to combat an alien invasion. (01:20:50)
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Answer: Flash couldn't travel through time later in the movie not because Zoom was alive but because Zoom was also tapping into the Speed Force, preventing Flash from gathering enough of the Speed Force to break the Time Barrier. When Flash originally went back in time it's likely because Zoom was in custody, therefore not tapping into the Speed Force at that time.