2 goals

canceled

The first match had ended in a 2-2 draw, thus a slight advantage for the home team. It was tough match and Van der Kroft quickly showed three yellows to Borussia. It was 1-1 at the start of the second half when the Dutchman canceled a Borussia goal for off-side. He actually overruled his linesman (Ben Hoppenbrouwer) who pointed a goal. A little later Borussia scored again, this time Van der Kroft pointed at the centre mark, but the same linesman ran towards him telling he had seen a foul. Goal canceled.
The match ended 1-1 making Madrid the winner on aggregate.

they say

There is always "they" and "some people". Well Some people said both canceled goals were legitimate. The Germans were furious. Van der Kroft got a lot of hate-mail (letters, old school ;)) . Allegations were made about the Dutch hating the Germans because of the war. Because of the lost final of 1974.

source

Harry Walstra on sportgeschiedenis.nl