Question: Why would Barry need Kara's help in gaining extra speed to return to his own dimension considering that the device he had on was capable of doing that?
Supergirl (2015)
1 question in season 1
Starring: Calista Flockhart, Melissa Benoist, Mehcad Brooks, David Harewood
Continuity mistake: Rick Malverne has handcuffs on when J'onn goes in as his dad. When he figures out it was J'onn, he tells them they have "23 hours and 14 minutes," looks at his watch and the cuffs are gone. (00:21:30 - 00:25:00)
Cat Grant: All four of you standing there doing nothing, you look like the attractive yet non-threatening, racially diverse cast of a CW show.
The Adventures of Supergirl - S2-E1
Trivia: When Cat Grant walks to her office door, she screams out, "Miss Teschmacher!" In Superman and Superman 2, Miss Teschmacher was Lex Luthor's assistant and him screaming her name was his way of getting her to run to him.
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Answer: It was an experimental device and was not meant to propel him into another world, it happened by accident. He need an extra boost of speed to get him back home.