If you miss the last week episode here’ my short recap, The office Sheldon acquired following Professor Rothman's retirement in The Rothman Disintegration is featured in this episode. Herein, the issue of the The Journal of Physical Chemistry A with a picture of Sheldon on the cover, first appearing in The Beta Test Initiation, can be observed framed on a wall. Sheldon gives Penny $1 for her labor to bring him the box of journals, quite like what he did in The Gothowitz Deviation (S3E03).
The Big Bang Theory Season 6 Episode 4: The Re-Entry Minimization, Howard returns to Earth feeling dejected when he finds out that his friends are not waiting for him at the airport at the request of Bernadette, who wants to spend some quality time with him. She, however, is having a cold, disabling them from spending some private time together. Howard feels further dejected when he learns that during his time away, his mother is having an affair with his dentist, Dr. Schneider and Stuart has taken over his spot in his friendship with Raj, since they are living together. Meanwhile, Sheldon, Leonard, Penny and Amy hang out at the guys' apartment and participate in guys versus girl’s competition.