There are not a lot of goal clips from NASL floating around the internet, but these few are great (although Marsh's 'goal' was called offside). I'd really like to add to this list so if anyone knows of a hidden collection of NASL goal videos (not collections, just single goals), let me know.
Johan Cruyff (--loud audio--)
George Best (--loud audio--)
Link to Youtube (Embedding was disabled for this video)