It's implied in this episode that the reason Ralph isn't particularly intelligent is because Chief Wiggum dropped him on his head
In all subsequent airings on FOX, the lesbian scene was cut but it is available when it aires on other networks and on Disney+. The scene where Bart lights the fireworks in the garage is also cut on airings only in the U.K. though.
In what is an odd coincidence the episode's acronym spells out MILF which somehow got past the censors.