At the end of this episode The Flash is no longer considered an Urban Legend and even has a billboard declaring him "Central City's Hero".
Barry should have had very little to worry about when they injected him with the truth serum. One of his abilities as The Flash is an extreme form of metabolism. Just as he burns through the energy he acquires through eating vast amounts of food, any drugs that enter into his system would be used up in a fraction of time it would take a normal human to go through.
Fosnight wears a jacket with a F on the left front side. It's very low on his chest, but when the cameraman cuts to a closeup of Fosnight supposedly fanning and shuffling the cards, the F is much higher, indicating that the stand-in card manipulator is wearing the same jacket but is taller than actor Dick Miller.
When Colonel Powers calls in for the location of Alpha, the radio operator refers to her as "Sergeant."
When Tina tracks Alpha, the display screen shows a longitude of 114 west and a latitude of 153 north. It's physically impossible to have a latitude of anything above 90 degrees anywhere on Earth, as that is the North Pole.
When Rossick opens up Alpha's skull, the seam where the upper skull prosthetic with the circuitry is clearly visible where it joins the actress' forehead.
You can easily tell that the money that The Flash is returning to the teller's drawers are not real. They don't even have the proper faces on them.
When Harry was "dead" in the first segment, you could still see his eyes moving a little.
Somehow the police were able to visually identify the two robbers even though they wore masks throughout the scene.
In 2010, John Welsey Shipp provided the voice for Professor Zoom/The Reverse Flash in the Batman: The Brave and The Bold episode "Requiem for a Speedster" (which centers around The Flash).
According to the Social Security card in Barry's wallet, his Social Security number is 547-29-6400. This number did belong to a real life individual by the name of Zabel Aivazian who died in 1987.
Among the headlines on Jason's paper is, "Robots Roll Where Man Fears To Go".
While doing some tests on a treadmill early in the episode, the replicant tops out around 347 mph before disappearing.
Tina's explanation early in the episode makes it clear there was only one prototype freezing unit. When Captain Cold is captured the first time, he has the freezing unit on him and it's presumably taken to the police evidence room. But when he escapes, he goes to his car where he has a second freezing unit hidden. There's no explanation for where the second one came from.
At the 4:27 mark, the Asian gangster who is supposedly frozen solid can clearly be seen moving.
While the handcuffed Flash and Terri Kronenberg try to first escape Captain Cold, the icy villain blasts the floor, causing the pair to skid into a workshelf. Watching the two fall, it is clear that they are not handcuffed
This episode seemed to have a few scenes switched around, as Barry gets the heater-belt from Tina after he had previously captured Cold and before he knew Cold escaped lockup.
When Kline gives his first show, the establishing outside shot of the station shows that it's night. Confirming this, later Desmond says that Kline's live show is at 10 p.m. However, as Kline speaks with Keefe and Frost, Tina and Barry are watching and it's broad daylight outside the windows of Barry's apartment.
The newspaper article about Derek's arrest spells his last name "Bohannon." However, the credits at the end spell the last name "Bohannan."
The mural on Nightshade's garage has changed since "Ghost in the Machine." It now reads "Crack Kills" rather than "Our world is in your hands - love it or lose it."