Questions asking about your job history, whether you can handle the physical and mental stress, availability throughout the week and at what times, reliability of transportation, ability to work legally within the US and some ice breaker questions sprinkled here and there.

Was interviewed by a manager because the HR representative was not there. Had me wait 15 mins because it was busy. Just had me talk about my future plans, how i work well in a team, why I want to work there and how i can keep up with rushes and pressure. Pretty straight forward, my advice would be to try to make a connection with whoever is interviewing you and really have an interesting conversation (for me it was about music) to show your personality and build a memorable impression.