SLEEPWALK - deadstring?

This has probably been covered many times (and if so Sorry, sorry, sorry, sorry) before BUT -I've been boning up the original Shadows Sleepwalk and right at the very end I am sure Hank dead strings the last note in the Cmaj7 (note of B) - or is it me?
Was it beyond the recording techique of the time to over dub that note?
They seem to have been able to do lots of work post recording - added Compression, Reverb etc - why keep the error (if indeed it is one) in?
Just curious
Ian
Was it beyond the recording techique of the time to over dub that note?
They seem to have been able to do lots of work post recording - added Compression, Reverb etc - why keep the error (if indeed it is one) in?
Just curious
Ian