Yeah, done that.  Watched a series, started 
collecting cels, but didn't re-watch the series 
until a year or two later.  

Did you find you had gained the ability (probably 
from looking at your cels so often) to spot a 
shot you have as a cel, without pausing the 
video?  Calmly watching, enjoying, then giving a 
little jump from your seat, "Got that one!"  
Then, of course, you have to rewind and pause, to 
note the background, so you can at least come 
close in color/saturation when trying to find 
something to put behind the figure!