When the platoon sets out from the fort, Macintosh's Indian girlfriend is watching them depart, with her face half-hidden by the shawl she is holding tightly under her nose. The next shot cuts straight to a close up of her face, but her hands are not in view and more of her face is hidden by the shawl.
At the end of the movie just before Mcintosh and his party enter the canyon for the ambush he tells the Sergent that they have to wait for Ke-Ni-Tay to take out Ulzana's sentry. However, the decision for Ke-Ni-Tay to take out the sentry was made by Lt. DeBuin after Mcintosh had led the other party into the ambush so there was no way for Mcintosh to know what Ke-Ni-Tay was doing.