给出一篇长文，对其中的语法错误进行修正并解释为什么是错误的。
下面是一篇英文长文，其中包含了多处语法错误：
     "Me and him went to the movies last night. We seen a really good film, but the sound was to loud. Also, their was a lot of people there so it was hard to find a seat."
The paragraph contains several grammatical errors that need to be corrected:

1. "Me and him" should be replaced with "He and I" as it is the subject of the sentence.
2. "Went" is in the wrong tense. It should be replaced with "went" as it refers to the past.
3. "Seen" should be replaced with "saw" because "saw" is the past tense of "see."
4. "To" should be replaced with "too" which means excessively.
5. "Their" should be replaced with "there" as it is the proper word to mean "in that place."
6. "Was" should be replaced with "were" as it is referring to a plural subject.

Corrected paragraph: 
"He and I went to the movies last night. We saw a really good film, but the sound was too loud. Also, there were a lot of people there, so it was hard to find a seat."