The camera angles and shaky cam. They seem to always use a close up, over the shoulder sort of style for nearly the entire duration of the fight.
In American boxing, they only use over the shoulder and close ups occasionally. It seems to be the default in British boxing.
Here's an example of what I mean. Notice how cinematic American boxing looks and how much real estate you can see, making it easier to assess distance, footwork and ring management.
American Boxing:
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And here's British Boxing:
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I like that such close up action above is good to show facial damage, expressions and such, but I wish it wasn't used the entire fight as it's a strain to follow the action,