Casual Danger Dialogue: One scene in the John Wayne film. After Crockett's encounter with Emil Sande, he's accosted by some of Sande's men. Bowie decided to help Crockett and he and Crockett become acquainted during the fight.
Oh Crap: No one ever says so out loud but, you can see it on the faces of the defenders fairly often.
Notably, Travis and Crockett's reactions in the 2004 film: Travis, when he looks upon the Mexicans surrounding San Antonio de Bexar for the first time, and Crockett, as he stops playing his violin when he hears the Mexican troops approaching the Alamo just before the final attack.
One Sided Battle: Only a few hundred men defend the Alamo versus over a thousand Mexicans. The the defenders hold out well, until they're overwhelmed in final battle during the climax.
Only a Flesh Wound: Smitty tries to convince everyone (including a cute little lady that's very concerned for him) that the wound he has is nothing serious. Then Beekeeper goes and pours Whisky on it!
Power Trio: The roles stand the same in both versions:
The Spock: Travis, the intellectual and well-educated leader trying to do what's right.
The McCoy: Bowie, the irrepressible, hotheaded, complete opposite of Travis.
The Kirk: Crockett, well-liked by both men, and acts as a mediator between the two.
Taking You with Me: In the Wayne version, all three leading men make an effort to take as many of the enemy with them as they go.
Worthy Opponent: Surprisingly, the Mexican army (though not Santa Anna himself) gets this treatment in Wayne's Alamo. One scene has two of Crockett's Tennesseans admitting they admire the courage of the Mexicans assaulting the Alamo, praising them as "fighting men." The Mexicans saluting Mrs. Dickinson and other survivors at the end suggests the feeling is mutual.