- Critical Research Failure: Cisco mentions that Caitlin has "Two doctorates and a PhD." This is a bit odd, as a "doctorate" and a "PhD" are essentially two terms for the same degree.
- Memetic Mutation: Cisco's translation algorithm decoding Barry's demented scribblings as "This house is bitchin'" was eagerly seized upon by the fandom, and spread throughout the entire Arrowverse.
- One-Scene Wonder: The Thinker makes quite the impression for only a few seconds of screentime.
- Special Effect Failure: The scene where Barry rescues Iris from Samuriod looks very much like it came from a video game, rather than a tv show.
- They Wasted a Perfectly Good Plot: Barry's departure left room for viewers to fully see how the team could tackle evil in Central City in his absence. However, since the main crux of the episode is bringing back Barry, this isn't explored fully in detail, relegated only in the six month Time Skip between Seasons 3 and 4. While it was not realistic to expect the show's lead to be gone for very long, it still failed to show how the other Team Flash members could keep villains at bay.
YMMV / The Flash 2014 S 4 E 1 The Flash Reborn