Casey's cover as the cable guy is for "Penumbra Cable." The penumbra is part of a shadow, hence his cover is working for "Shadow Cable."
In the background at the beginning of this Valentine's Day themed episode, an unknown woman's arms caress extra Jesse Heiman. This could be referencing his appearance in a super bowl commercial where he kisses supermodel Bar Raffeali.
The phone number on the grocery list given to Chuck by Sarah is the information number (805) 555-1212 which has a California area code.