没有缺少什么。先行词是film,在后面的定语从句中当see的宾语，用“that/which”代替，先行词当宾语时，可以不填。分开看，从句是：I would like to see some films.
that I would like to see
缺少了宾语成分，see 是及物动词，要接宾语
完整是 there are some films that what I would like to see。所以是缺少的see 后边的宾语。
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