While the Captain and the crew show themselves to be utterly clueless as to cultural mores of Earth, yet - as do many Earth men - Dave's left ear is pierced. However, the Captain, after whom "Dave" is modeled, also has a pierced left ear. It is quite possible that "Dave" has ALL the Captain's features, including a pierced ear.
When the captain is back and taking over the ship, the screen shows spelling error twice, first "System Overide Access" and second "System Overide Enabled". However, the correct spelling is "Override" with two R's.