Visible crew/equipment: At the end of the film when Samantha enters the diner to meet Jack, the reflection of the outside glass door shows film crew members. Probably the Script Supervisor and Director. (01:48:36)
Visible crew/equipment: Towards the end of the film, when Sam runs back for her hug, a red haired woman in a purple coat appears briefly on the right.
Answer: Although it's technically a mistake, it is common in films to show military officers in dress uniforms with medals and ribbons to show that particular soldiers are important. A layperson may not know military uniform protocols but they can certainly tell that dress uniforms with a lot of medals signifies high rank at a glance.