Identify the error in the following sentence: I seen the movie last weekend.

The identification of the error in the sentence "I seen the movie last weekend" revolves around the use of the verb "seen." In standard English, "seen" is the past participle of the verb "see" and should be used in conjunction with an auxiliary verb, such as "have." The correct past tense form of "see" is "saw." Therefore, the corrected sentence should read, "I saw the movie last weekend."

This emphasizes the importance of using the appropriate verb form based on the tense being conveyed in the sentence. In this case, the error is not related to spelling, subject-verb agreement, or sentence structure, which validates why the correct choice focuses on the verb usage rather than a spelling error.