Herman goes to try to take Heidi to the Lords' concert but leaves alone after she refuses to go with him, under pressure from the older women. In the next scene, however, Heidi and Herman meet the other Herman outside the concert, before Heidi leaves again to return to the three women.
In Salem, witches were hanged, not burned as is popularly supposed and also shown in the movie.
On her web biography page, Heidi's name is spelled Adelheid Elizabeth Hawthroen instead of Hawthorne.
The record is labelled as being by 'The Lords'. Herman then says they will call them 'The Lords of Salem', and that is how they are referred to from then on. Nobody talks about 'The Beatles of Liverpool', or 'Nirvana of Seattle'. The DJ knows the band's name. He would not change it as that would mislead the audience and could cause legal problems.