I remember a pre-season friendly with Rangers at Firs Park in around 1990. The score wasn’t devestatingly huge- 2-0 to Rangers, if I remember correctly.
My main memory though is sneaking in after the door officials had gone to watch the game about five minutes after it started.
My cousin had a house on Victoria Road and you could see one goal until they built houses opposite. He was able to delay them by putting into an objection about them ruining his view.