I was just moving the flag around to make sure it moves like a normal mailbox flag. The flag moves fine, but when I rebuild the sketch it causes errors in the door hinges. The flag is not mated to the hinges at all.
You created an assembly level feature (CBORE for #5 Binding Head Machine Screw) and neglected to set the "Feature Scope" of the feature to "Propagate feature to parts". As a result, when you open the part...the feature is not there.