I'm editing a review of a TV series, and I'll be editing clips, but the clips are constantly going to the next shot/scene right before the cut happens.

EG: A shot of someone talking, then for ONE microsecond, a shot of a building, before it cuts to the next clip of another character.

I didn't want that building in there. I deliberately cut the clip to where the building wasn't there in the last frame. In the Trim editor itself, it shows that the first and last frames are both of the character talking.

Even the video itself in the preview window makes it seem like everything's fine; but the fully rendered video will show off all the jarring cutting. So then I go back to the file, zoom all the way in, and see that the final few frames contain a different shot at the end.

Why isn't this shown in the Trim preview? Why is it not reliable?

And yes I usually don't cut things that closely, but sometimes it works much better.