Continuity mistake: At the end of Porky's, you see Mickey Jarvis on crutches and covered in bandages after getting beaten up by Porky. In the beginning of Porky's 2: The Next Day, Mickey has miraculously healed. He jumps out of his truck to catch up with the other guys, no crutches or bandages and he is walking fine.
Continuity mistake: The recording that the 3 boys did of the mayor and council members, in the basement of the courthouse, is not consistent with the one played back, at the rally, at the high school. Words and phrases are both omitted and added in the playback, especially the word "mayor", which is heard more in the playback.
Continuity mistake: Towards the end of the movie, at the Reverend's rally, he's singing a hymn. When shown from the side, the Reverend's hair is neatly combed and sort of slicked back and his shirt is buttoned all the way up. When he finishes and turns to the front, his hair is different and his shirt is unbuttoned.