Some examples of preferences, thoughts, opinions, personality traits, experiences, etc that Sam has picked up from other people.

Craving for NY hot dogs (Steve and Bucky)

Tendency to say "I'm fine" when he might actually be dying (Shiro)

Dying alone in space (Shepard)

Speaking Russian (Bucky)

More frequent dissociation, particularly mission-related (Bucky)

Extra enthused about technology (Katie)

Aversion to mind control (Clint and Bucky)

Except when it's Damon (Damon)

Breathes in sync with Clint whether they're in the same room or not.

Strengthened tendency to fight for a cause and never ever give up (Steve and Misato)

Aversion to eye trauma (Damon)

Occasionally still feels hungry no matter how much he eats (Damon and Shepard)

Wow blood would be pretty tasty (Damon)

The Prothean cipher/memories from the Prothean beacon (Shepard)

Enhanced need for physical touch / grounding using touch (Misato / Bucky)

More varied hand-to-hand/acrobatic knowledge (Clint)

Craving for cigarettes (Steve and Kavinsky)

Occasionally becomes off balance expecting his left arm not to be there (Bucky)

Aversion to pureed and liquid foods (Bucky)

Dreams about falling (Bucky)

Knows the words to way more country songs than he ever wanted (Clint)