Visible crew/equipment: As the S.E.A.L.s retreat down the mountain, the camera crew is visible at rear, bottom right. Red optical mount and clean-face cameraman are a dead giveaway. (01:08:00)
Character mistake: When Murphy calls his command, a Marine Staff Sergeant answers the phone as "Sergeant." Maybe in the Army, but a Marine Staff Sergeant would never refer to himself as Sergeant.
Audio problem: When the SEALs in the Chinooks take fire, a helicopter crew member fires their weapons. The weapon is a M240 7.62mm Machine Gun, but the audio of it firing is that of an M134 Minigun.
Factual error: Throughout the film, the SEALs are seen wearing Mechanix gloves, but the type seen are the current type. What distinguishes them from older models is the velcro wrist strap. The older models had an elastic, velcro strap, while the newer ones have a reinforced, rubberized velcro strap. The newer type as seen in the film is inaccurate for the time period.
Answer: The exact quote was "there's no medicine in a gunfight," meaning the SEALs couldn't just stop shooting at the enemy to help another SEAL who was injured. They're speaking more broadly of the "Self-aid" concept, where each person needs to look out for himself until someone else can come provide medical assistance.
Excellent answer.