Sheldon is watching Saul Perlmutter receiving his Nobel Prize live on television. The episode was indeed broadcast on 8th December 2011, the same day that Perlmutter did receive the Nobel Prize.
The actual award ceremony is always held on December 10th.
The actual award ceremony is always held on December 10th.
As a weird thing mentioned by Sheldon, The Harlem Globetrotters did visit Pope John Paul II at the Vatican in November 2000 and named the Pontiff an Honorary Harlem Globetrotter.
When Amy asks Penny whether she can get Leonard's blood to check his serotonin levels, Penny mentions that Leonard isn't crazy about needles. In The White Asparagus Triangulation (2008), Leonard vomited at the prospect of getting stitches with a needle, and later burst into tears during the procedure.
Marks the fourth time that Leonard's and Sheldon's WiFi password is changed to stop Penny from using their internet without paying. It was 'pennygetyourownwifi' in The Roommate Transmogrification (2011), now been changed to "pennyalreadyeatsourfoodshecanpayforwifi" (no spaces).
Both Penny and Jimmy Speckerman, were very similar as school kids. Both were bullies but believed that their victims weren't being bullied but were just part of pranks that they played on them.