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The hostess to the puzzle room is played by Molly Morgan, who also played Bethany in season 3 episode 3 The Gothowitz Deviation.
Professor Proton's "Force ghost" appearance is based on Obi-Wan Kenobi in Star Wars Episodes 5 and 6. However, his lightsaber hilt is the one that Obi-Wan uses in Episodes 1 and 2, as opposed to the rusted version seen in Episode 4.
That being said, Force ghosts don't typically carry lightsabers.
Leonard suggests to Penny to make out on Sheldon's spot and Penny says that this was the least sexy thing she's ever heard, while on the 4th episode of the 3rd season, she said to Leonard "Wanna do something crazy? Let's make out on Sheldon's spot."
Amy mentions the train has an FA-4 locomotive, but the actual model of the locomotive that the Napa Valley Wine Train uses is FPA-4.
The 2013 Comic Con sold out in 93 minutes and had online ticketing glitches.
In this episode, Penny gets a guest role on NCIS. Raj comments that Mark Harmon is a dreamboat. He should know, since Kunal Nayyar had a guest role on NCIS before working on The Big Bang Theory.
While the gang is decorating the Christmas tree, Sheldon (who is in Texas) video calls Amy. Amy takes the tablet and shows Sheldon the room. However, nobody seems to detect that Raj is sitting in Sheldon's spot. A few moments later, Raj makes a comment and Amy directs the tablet his way. Even in such close proximity to each other, neither Sheldon nor anybody else detects that Raj is still sitting in Sheldon's spot. This goes on throughout the entire episode, even when Raj switches places with Howard.
Amy states that the last time Sheldon was in the zone, he tried to figure out how electrones travel through graphine. Yet, when that happened during season 3, Amy wasn't introduced yet. The others could have told her about that, though.
Despite Amy's insistence that Indiana Jones' presence was not necessary to the story, the Nazis did not know where the headpiece was located and they followed Indy to Nepal to obtain it from Marian. First Amy was wrong and then the other guys when they seemed to acknowledge her fact.
Goof (Continuity): When Bernadette asks Howard if he wants some brownies, it is very clear that they have nuts in them. Howard is highly allergic to nuts (as seen in The Peanut Reaction); why would Bernadette make them with nuts if she knew Howard was highly allergic?
When Sheldon says that watching "Clash of the Titans" was causing Penny nightmares, he had probably watched it himself since the Kraken that attacked Leonard in his nightmare is seen in that movie. Also, Sheldon previously mentioned Kraken in episode "The Date Night Variable" by citing the line "release the Kraken!" from Clash of the Titans.
Goof: When Raj receives a message from Lucy saying she's not coming, he's holding the cel phone with his left hand, then in the next cut, he has it with the right hand.
In the first scene when they were all in the university's cafeteria, everyone in the background is wearing glasses. Except for two, all the extra's had glasses on.
The show Sheldon was sad about being cancelled, the last episode of Alphas aired 22 October 2012 on Syfy.
Raj's RKoothrappali1 exists on YouTube.com, but it doesn't seem to be legit.
In this episode Sheldon says, "I've got the b word." But in Season 1 Episode 2 Sheldon actually says, "Gravity thou art a heartless bitch." Guess sometimes he is comfortable saying the "b word" and sometimes he isn't.
We get a glimpse of Howard's mother.
Goof: Sheldon said he wouldn't be comfortable with a prostate exam which seems unlikely. In an earlier season when at a faculty party for the University the Dean (or President) goes to shake Sheldon's hand and then says, "Oh right. You don't like being touched." Sheldon responds, "I don't have an issue being touched. I have an issue with germs. If you properly glove yourself you can give me a rectal exam." It would seem if he would be comfortable with that then he would be okay with a prostate exam so long as it was preformed by a scrubbed and gloved medical official.
One of Sheldon's GPS trivia questions is what four state capitols are not served by the Interstate Highway System. There are five capitols: Juneau (AK), Carson City (NV), Dover (DE), Jefferson City (MO), and Pierre (SD).
GOOF: Sheldon says that he went to see Santa at the Baybrook Mall in Galveston. Baybrook Mall is in fact in Houston (20 miles southeast of downtown with a Friendswood mailing address) and 30 miles northwest of Galveston. The always precise Sheldon would not have made a mistake like this. Being Jim Parsons is actually from Houston, makes this goof even more unusual.
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ensemble cast, unrequited love, laugh track, girl next door, geekcentric