The name of the man working at Sparkletts wearing an eye patch (the one that Sheldon asked if he could look behind it) mentioned in The Separation Oscillation (2015), is revealed to be Omar.
The episode won an Emmy Award for Outstanding Multi-Camera Picture Editing for a Comedy Series.
We learn from Stuart that he has a brother and sister, and that he still has a grandmother, even though he said in The Friendship Contraction (2012) that his grandparents were dead.
Sheldon really shouldn't have to fear his mother's reaction to him and Amy living together unmarried, since he once caught his mother having "relations" with a man out of wedlock in The Mommy Observation (2014). Had his mother reacted negatively to his news, he could have easily confronted her with her own hypocrisy.
This is the sixth Christmas episode in the series; the others are The Bath Item Gift Hypothesis (2008), The Maternal Congruence (2009), The Santa Simulation (2012), The Cooper Extraction (2013), and The Clean Room Infiltration (2014),