"Look, I don't know, I guess our wires have gotten crossed a few times the last few days, but I think that hardly rises to the level of a crisis. After everything we've been through together, you and me, we're Barry and Iris. We're the gold standard. I am so in—"
"Then how could you leave me?! You left me, Barry. You just left me, standing there, alone. How could you do that?"
Barry Allen and Iris West
"Mixed Signals" is the second episode of the fourth season of The Flash, and the seventy-first episode overall. It aired on October 17, 2017.


Barry has his hands full when he takes on a dangerous meta who can control technology, while also confronting an obstacle in his personal life: the ramifications of abandoning Iris for six months to balance the Speed Force. Meanwhile, Gypsy breaches in for a hot date with Cisco, but she gets annoyed when his work keeps them apart.[src]



Guest starring





  • The scene with Barry dancing in his boxers while preparing breakfast is a homage to the dance scene performed by Tom Cruise in the film Risky Business.
  • Barry paying for his coffee at CC Jitters using superspeed is a homage to Superman: The Animated Series, episode "Speed Demons".
  • Barry watches a sped-up version of all of his favorite shows in order to catch up. Amongst these shows includes Jon Snow from the TV series Game of Thrones dying and coming back to life, which occurred in the episodes "Mother's Mercy" and "Home", respectively.
  • Cisco likens Deacon's revenge spree to Richard Hendricks from the TV series Silicon Valley killing everyone in his company, Pied Piper. Barry suggests that he's more like Bertram Gilfoyle, though Cisco believes him to be more Erlich Bachman than Gilfoyle.
  • At her home, Sheila Agnani plays the video game Dying Light.
  • Cisco uses the expletive "frak" from the Battlestar Galactica franchise when Deacon locks him out of his own programming.
  • In Barry's new Flash suit, there is a feature called the "Babel protocol"; a self-destruct mode created by Cisco, who defends its creation on the grounds that they have already faced one evil version of Barry. This could be an Easter egg reference to the popular storyline JLA: Tower of Babel, in which Batman is revealed to have studied the weaknesses of his teammates, including Flash, and planned methods to take down each of them in case they went rogue (in Batman's case, his protocol for stopping the Flash was a "vibro-bullet" fired at Wally West that caused him to experience seizures at light speed).
  • DeVoe claims to have completed Schubert's unfinished eighth symphony.
  • Cisco mentions how Earth-19 has Saint Shaquille O'Neal's Day, referencing the popular retired basketball player.
  • At Sharon Finkel's office, Barry finds a newspaper article that reports about the discovery that Oliver Queen is the Green Arrow. This is a reference to the twist at the end of the Arrow episode "Fallout" (which aired one week before this episode), when there was a report on the news about this coming to light, due to a doctored photo of Oliver in the Green Arrow being leaked by an unknown individual).
  • When Barry and Iris listed the people they lost, one of the names Iris mentioned was Laurel. However, Iris never met Laurel on-screen.
  • Barry's HUD display is brought up by lenses that go on his eyes. In the comics when Wally was the Flash, he also had lenses similar to these, although they were white.
  • This is the fourth episode of the series not to feature Tom Cavanagh.
  • Iris' "We are The Flash" line to Barry in this episode would eventually be used as the title of the fourth season finale.
  • The penthouse Kurt Weaver tours at the beginning of the episode is in the same building used for Ramon Industries.
  • The t-shirt Cisco wears in this episode illustrates Schrödinger's cat.


  • When the remains of Tim Kwon's car slide up to the barrier, one of the tires hits it a couple of seconds later. When it does, the barrier bounces away and then back. In reality, the barrier would be either a concrete Jersey barrier or portable plastic Jersey barrier, which is filled with water once in place. Neither would move and rock from the light impact of a rolling tire as they are too heavy and designed to stop or deflect a car, which is about 30 times the weight of the tire and wheel. This is either a prop "concrete" barrier or a plastic one that was not filled with water.


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