Goofs

The button found by the Germans after the bridge sabotage, pointing to U.S. involvement, was not on any of the uniforms at the event.

Colonel Hogan makes a reference to the U.S. highway system, which did not yet exist. US Interstate highway system wasn't formed until June, 1956, under the Eisenhower Administration.

Actually, it mentions a freeway. Freeways have been around for many years, including in Ohio, where Hogan is from. Many of the freeways date back to 1926.

When Hogan tried to create infighting between Inge Wagner and Heidi, he made a BIG logic error Inge should have picked up then or later.

First, Hogan told an Inge Secret she blaming Heidi for telling him.

Then, he told a Heidi secret blaming Inge Wagner.

Here is the logic error.

Inge knows she never told Hogan any secrets about Heidi. She'd gone: Hmmpth, Hogan lied; Heidi was telling the truth.

More important was Hogan knew things about the three girls and none of the three told him.

Then or later, Inge would have figured out thinking "Where did Hogan get his information?"

Camp 13 would have been discovered. The series would have had to end right there.

When Schultz is looking at the 'U.S,' button with reading glasses, production lights are reflecting off the lens of the glasses.

Carter is not married. Yet, while holding a broom in the barracks, actor Larry Hovis' real-life wedding ring is seen.