Starring: Salli Richardson-Whitfield, Colin Ferguson, Erica Cerra, Neil Grayston
This One Time at Space Camp... - S4-E18
Other mistake: When Holly and Fargo are playing Dungeons and Dragons, Holly rolls a d20 die and yells, "Critical hit!" but we can see the 20 on one of the upper sides of the die, meaning that she actually rolled a 2, which is most definitely not a critical hit (and actually nearly a critical miss).
In Too Deep - S5-E8
Plot hole: Carter is apparently just learning about Feynman's Day, which Allison explains as "Eureka's version of April Fool's Day." It's highly improbable that Carter could have lived in Eureka for five years and still be oblivious of this, especially given all of the hijinks that happen.
Marshall Jack Carter: Let's not shoot the crazy end-of-the-world machine just yet.
Trivia: When Allison and Jack are talking about their relationship and marriage is mentioned, Allison says "is it so inconceivable?" This episode features Wallace Shawn (as Dr. Hughes). Shawn starred in "The Princess Bride" where his character was known for saying "inconceivable."
Question: When Jack and Jason go to talk to Todd about MACAA, Todd tells them that they destroyed it in Section 14 pit followed by a nuclear explosion. If it was destroyed, where did the version that is missing from the shelves come from?