The actual track logs have a number of shortcomings:
At the time I carried my GPS in my pocket with the result I frequently lost the signal. (Straight lines that do not follow paths);
I sometimes went astray (got lost!) and these tracks are included;
I occasionally took an alternative route.

The major points where I went astray are :
At Crackpot Hall. After stopping to view the ruins head upwards towards the building above the quarry.
About one third of a mile after passing through a gate across the track, between Swinner Gill and Gunnerside Beck, it bears to the right. The spot is marked by a small cairn on the left of the track. Follow the initially indistinct path to the left at this point and descend to Gunnerside Beck.
From Gunnerside Beck it is easy to go astray. You can scramble up Bunton Hush (no clear path) or double back on the path shown in green on the map below. Neither path is very clear. (click map below to enlarge).

At Surrender Bridge the bridleway shown on the map does not exist on the ground! Avoid following the lower path along the river as this becomes very precarious. Instead, head uphill eventually reaching a cairn. (click map below to enlarge).
In Marrick I turned right shortly after entering the village instead of continuing through to the far end.

My alternative routes are:
Following the cycle track instead of the road through Moor Row. A recommended alternative that avoids having to cross the A595.
The Red Pike and High Stile alternative. Enjoyable in fine weather no doubt but don't do it in rain and mist! If you take this route then after Innominate Tarn follow a more direct path across to the quarry clearly visible in the distance.
If you want to avoid the boggy ground beyond Nine Standards then when you reach the Nine Standards Rigg viewing point continue straight on along a clear path (blue line on map) which meets with the green route after about ½ mile.(click map below to enlarge).

When you reach the track at the top of East Grain do not follow the footpath sign across difficult ground but stay on the track.
Around 0.4 miles from Cringley Bottom the track forks (there is a large sheep fold to the left of the path) and the official route starts to descend. If you bear left at this point then a good track (not marked on the maps but visible on Google Earth) rejoins the official path without the need to descend and re-ascend. (Red line on map below - click to enlarge).
In Arncliffe Wood the public right of way, shown on maps, no longer exists as a path on the ground. Simply follow the forest track up to the point where it meets the Cleveland Way