Factual error: A map of Canada appears behind the guys as they're being questioned by the Mounties. The territory of Nunavut, which was not officially drawn until the year 2000, appears on the map. It definitely did not exist in 1978. (00:18:45)
Factual error: The city of Winnipeg is spelled incorrectly on a road sign that appears while they are at the border, spelled 'Winnepeg'. (00:09:35 - 00:10:10)
Factual error: Sizzling Sara is doing her live radio broadcast in front of a rack of magazines. One of the magazines is a Robin comic book. The series of Robin comics that used that logo began in 1993, 14 years after the episode takes place. (00:15:35)
Over the Hills and Far Away - S5-E6
Continuity mistake: When the girls go to Marquette the signs say 'GO GOLDEN EAGLES', however before the mid-1990's Marquette's nickname was 'the Warriors'.
Roller Disco - S3-E5
Revealing mistake: When Jackie and Fez are doing their Roller Disco routine, it becomes very obvious that doubles are used for many of the routines. Fez does a lot of his own stunts but Jackie does very few. While they do a decent job of hiding the stunt doubles, there are several times when you can see the faces of the doubles and it is obvious it is not Mila Kunis or Wilmer Valderrama. And you do not need slow motion or stop action to see the difference. (00:11:10)
Factual error: Kelso is wearing a t-shirt with Dirty Harry on it saying "Go Ahead, Make My Day". Sudden Impact was the first Dirty Harry movie to use that expression and that film didn't come out until 1983.
Continuity mistake: After Eric's mishap with Donna's wedding dress, Kelso is in the Forman's driveway with the canoe (yes, a canoe), and the scarf around Kelso's neck changes repeatedly.
Continuity mistake: When Red and Eric were talking in the driveway there was a van right next to them. The tail lights shown on that particular model were only produced in the mid 80's and later.
Continuity mistake: In the second episode of the series Eric's Birthday is in May. The second episode of season 5 Eric says his birthday is in March. In season 6 Eric's Birthday occurs after graduation, which would make his birthday after June.
Continuity mistake: When Donna sees Eric in the driveway, and they apologize to each other, her two braids have a mind of their own as they move up, down, and every which way, as she and Forman speak.
Factual error: Several times, Fez claims to love the book "Superfudge", reading it once a month. However, it wasn't published until 1980.
Won't Get Fooled Again - S6-E13
Continuity mistake: When Eric bursts into the kitchen to tell Kitty and Red, who are sitting at the table, that Donna is not pregnant, the items on the table change position depending on the angle of the shots.
Continuity mistake: Aston Kutcher slides out behind the car and screams in excitement while blowing an air horn. When he does, the wind messes up the front of his hair. A few shots later, it's neatly combed again.
Continuity mistake: In the scene where Kelso enters Jackie's room (the second time) when she is sick, she throws the teddy bear at the door. When Kelso enters there is a shot of the bear in front of him at his feet. The scene changes to only show him from the waist up (he never moves) and then changes to a longer shot where he is still seen. The bear, once at his feet, is nowhere to be seen. The shot then changes to Jackie and back to the longer shot of Kelso. The bear is now behind Kelso's feet.
Character mistake: Fez clams that he has never seen snow before, however this episode takes place January '77. there have been episodes with snow that date earlier, eg. "The Best Christmas Ever" which had snow in the background of the set.
Continuity mistake: When Eric and Hyde are speaking while sitting on the couch, Eric's left leg is either over his right leg or under it, depending on the camera angle.
Continuity mistake: When Red throws the keys to the Vista Cruiser to Eric, you can see he (Eric) catches them with both hands clasped together, then the camera cuts to show Red and Kitty (with the back of Eric's head) you see now that his right hand is clenched in the air, then it cuts again and his hands are clasped together again. He could not have moved his hands that quick.
Continuity mistake: In the scene where Eric gets the keys to the Vista Cruiser, just after he catches them, you can see that the door to the living room is wide open, but before when Red and Kitty were telling him the responsibilities of owning a car, it is closed. No one had gone through the door during the entire scene.
Factual error: Eric makes a reference to "Sophie's Choice." This episode is set in 1978, but the book "Sophie's Choice" wasn't published until 1979, and the film adaptation wasn't released until 1982.
Answer: It's Ashton Kutcher's dog.