Sheldon says that Garfield has no reason to hate Mondays because he is a cat, and thus doesn't work. Actually, writer Jim Davis himself once stated that Garfield's life is basically the same from day to day, but for some reason, a disproportionate amount of misfortune and bad luck seems to occur on Mondays. Garfield hates them because it is when he realizes that his life is an empty cycle of repeating days, and the Mondays are just a bit more awful than the rest. There is also a popular fan theory that Garfield hates Mondays because that is when Jon, his owner, goes to work; therefore, this is his way of saying, without actually saying it, that he loves Jon.
When Amy is telling Sheldon about why Indiana Jones has a 'glaringly obvious' plot flaw, the apartment flag on the fridge is upside down, indicating the apartment is in distress (after Amy tells Sheldon about the plot flaw).
When Raj and Stuart post their internet profiles, the first view on Raj's post is from user "Jenny309." 867-5309/Jenny was a popular hit song in 1982 for Tommy Tutone.
Sheldon and Amy watch Little House on the Prairie (1974). Sara Gilbert (who appears in this show as Leslie Winkle) is the half-sister of Little House star, Melissa Gilbert.
This episode marks the first time Amy watches Raiders of the Lost Ark (1981). She turns down watching the film for a girls night in the episode The 21-Second Excitation (2010).