The scene where Jaccapo is buying the estate for the count...
Granted, when you're watching a movie, you have to have some suspension of disbelief, but something about that scene irks me. I like the movie, but every single time I watch this scene, the "emeralds," "rubies," and diamonds they show cascading out of the back of the cart along with the coins just look way too fake. They're cut (shaped) too similarly, because clearly they're plastic, molded into a "jewel" shape.
I really don't understand why they made the choice to include those fake jewels in that scene, because every other time you see the treasure, like when Danglars is stealing part of the treasure at the docks, and opens a chest to check what's inside, it only seemed to consist of coins. If they'd made the fake jewels out of colored glass, it still would have looked fake, but the way the light refracts through them reminds me of translucent dice. Even watching in standard definition they look fake, now watching it in 1080p, they look even worse.