Character mistake: When wondering how close they are to the top of the cliff, Xavier asks Magneto "How much further?" The word "further" is used for non-measurable or figurative advancement. He should have asked how much farther, as that refers to actual distance between objects. An educated man like Xavier would certainly know the difference between the two. (00:02:44)
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Suggested correction: While "farther" is used for physical distance, further can be too, especially in British English. Farther also tends to be used for a measured physical distance, so if the actual distance isn't known, further can be used. What Charles said is grammatically correct.
