Lets do some dissection here. First, this is a passive sentence and in writing, passive sentences should be avoided when possible. I'm not sure about "visuals of the film". Your example is a wedding ring, etc., so would it be more appropriate to say "visuals in the film"? I am asking because I don't know your context. Except in special instances, a comma is not included before "such as" so your non-punctuation of the sentence is technically correct, but you could substitute "for example,". The sentence is a little wordy, so I agree with pruning it of unnecessary words. I am an editor of 30 years, and this is what I would do with it:
Many other visual issues in the film give away the plot, including Cobb's wedding ring and his children's ever-changing wardrobe.