Bionic Hearing Aids

I am seeking for examples of vital tract holes in movies. Not an unused detail, but a hole so big it kinda creates the movie not work in a way. For example:

Citizen Kane: Charles Foster Kane lays alone in his bed staring in to a sleet globe. He whispers “Rosebud”, afterwards dies. The sleet creation falls out of his palm and breaks on the ground. The helper afterwards comes in and finds him dead. The rest of the movie is outlayed perplexing to find out what Kane’s final word “Rosebud” means.

See the hole? Re-read it…I’ll wait. See it now? Yep, there was nobody in the room when he whispered “Rosebud”. So possibly the helper has bionic hearing…or the shining Mr. Wells left a vivid tract hole in his masterpiece.

Casablanca: Everyone would kill to get the letters of movement sealed by DeGaul himself so the ***** will let them leave Casablanca.

SO? Gen. DeGaul was the personality of the French insurgency to the **** occupation, a sworn rivalry of **** Germany.

Can you name an additional similar to that?