Stargate SG-1 (1997) - 10 major mistakes

Continuity: Carter and Cadet Haley enter the Stargate and we see them through the "puddle." When they come out on the other side, their positions are reversed.

Revealing: As we know, the watery image of the event horizon is projected onto a blue backdrop. In "Origin" the third episode of season nine, Ger'ak comes through the Stargate and we can see the image of the event horizon, though faint, around and above the Stargate itself and is not confined to normal area for the event horizon. Blatantly visible if you look for it on the airing of the episode on the Sci-Fi network.

Revealing: When Hathor turns Jack into her first new Jaffa, you can see the line between his chest and the prosthetic that gives him the Jaffa "pouch".

Continuity: When Teal'c attacks the blonde Jaffa, the Jaffa has a staff weapon, but the shot changes when Teal'c hits the Jaffa and the staff has disappeared.

Other: When O'Neill first goes to visit Teal'c in his cell the symbol of Apophis on Teal'c's head is upside down.

Continuity: You hear "chevron four encoded" but the third chevron lights up.

Visible crew/equipment: When O'Neill, Carter and Quinn meet Teal'c at the ship wreckage, the camera moves to focus on O'Neill. The shadow of a boom mic on the ground follows his path.

Continuity: When O'Neill and Carter arrive at Washington, Carter says "Don't worry, Sir. These were my old stomping grounds." O'Neill replies with "I'm sorry to hear that." But later when the reporter approaches O'Neill in the bar the recording says "My condolences."

Visible crew/equipment: When Daniel is talking to Teal'c and the other Jaffa, at one point we can see a light reflecting screen reflected in Daniel's glasses, we can even see the silhouette of someone's arm and body in front of the screen.

Revealing: When Daniel is talking to Teal'c in the jail cell, you can see a camera light reflected in Daniel's glasses.