Goofs

Mack starts out the series with a noticeable scar on the left side of his face. This changes from one episode to the next as the scar disappears.

In an Army unit there would actually been several layers of command between the Colonel (later Brigadier General) and The Unit itself. This would have included at least one Major or Captain and one or more Lieutenants. While the Colonel would have overall operational command at the base level, the junior officers would likely have had more of a direct command and control responsibility for the enlisted personnel.

It's clear (probably due to series low budget) that many of the scenes, including those supposedly filmed on the base located in an unnamed Midwestern state, are actually shot in Southern California.

This is especially noticeable during scenes which reflect changes in seasons and which show hills covered in the dried brown grasslands common in Central and Southern California.