As of 2007, the turnoff to Peggy Pond Trail 1375 from the Deep Lake Trail is not marked.
As of 9/2013 the Peggy's Pond Trail is marked. The main trail makes a switchback to the left and if you go straight instead of making the turn you're on the Peggy's Pond Trail. The sign is a little bit down the trail (10'?) and on the left.