Continuity mistake: When Jemma, Skye, and Ward are at the Academy it is daytime. When Seth and Donnie are in the parking garage it is night time briefly. Then, it becomes daytime when they flash back to Ward, and remains daytime when they flash to Seth and Donnie.
Continuity mistake: After the interrogation, Skye tells Agent Coulson about Agent Ward. Coulson says during this scene,"It's a magical place" and Skye says "Ward doesn't like your style. Kinda think I do." At The End of this line, Skye is looking at Coulson. In the next shot, she's suddenly looking 90 degrees in the opposite direction. (00:26:55)
Continuity mistake: In the scene when Coulson is using a diagram to explain to The Team that Cybertek is the common denominator of everything that's happened during the season, he starts tracing lines that connect various bubbles of the diagram to each other, ending with one that links "the bus" to "GH-325." In the next few shots that last segment suddenly disappears, only to reappear later on. (00:04:15)
Continuity mistake: When the Asgardian bends the knife, he bends the tip up at the very end. When he takes his hand off the knife, the entire front half of the knife is straight. The shot changes again and the knife is bent differently again. (00:24:15)
Continuity mistake: When Simmons is scanning the tree, first she holds the scanner vertically, then the shot changes and instantly she is holding it horizontally. (00:07:50)
Continuity mistake: In the interrogation room, Skye asks "The truth. What are you after?" and Agent Ward replies "World peace." A few seconds after this line, the light on Skye's head and hair keeps appearing/disappearing/changes position. (00:22:25)
Continuity mistake: When Agent Ward goes onto the aircraft to find Agent Fitz and Agent Simmons having an argument, Simmons put a cup of coffee on the desk. It vanishes from the desk a few seconds after she does this. (00:15:40)
Continuity mistake: As Mike watches the news in the cafe, he is seen lowering his head just as the shot from the reverse angle ends. From the following shot in front of him, he is seen lowering his head a second time. (00:11:10)
Continuity mistake: When Ward is in the apartment in Paris, he begins a fight with two people. At a point during this fight, a couch is knocked over and two cushions fall off the couch. The cushions disappear a few seconds later. (00:04:45)
Continuity mistake: In the opening scene where Mike and his kid have a conversation outside a toy store, an explosion comes from the top floor of an apartment building. Just before Mike runs off to go save some of the people from the building, he says "Stay with Bernie" to his kid and Bernie then does this. After he says this and runs off, the kid and Bernie are a good foot away from the toy store. The next shot when Mike shouts "Watch my boy!" to Bernie, the kid and Bernie are a great distance away from the toy store without any time to move. (00:01:20)
Chosen answer: Coulson believes he was resuscitated then sent to Tahiti to recuperate. "A magical place," he calls it. But in the "Agents of S.H.I.E.L.D." episode "The Magical Place", Coulson, through a mind-reading machine, learns that he was treated by S.H.I.E.L.D. and a fake memory of Tahiti was placed as a "mask" of sorts over the painful memory of the operation, which involved a drug seemingly of alien origin to repair the damage, coupled with a lot of morally dubious surgery.