The red glove (and other early rumors)

[Nerys Myk]

Sometimes a banana is just a banana

 

[NewHeavensNewEarth]

Most cases this is true, but sometimes trailers let loose a big money shot, lessening the emotional impact of the finale.

Yeah! That's how exactly how I felt about Prometheus.

Spoiler

Every trailer prominently showed the Prometheus bringing down the Engineer ship, so when it finally reached that cliffhanger moment in the film, it was no cliffhanger at all.