These are all just minor changes and tweaks to take into account feedback gained from the major network change back in February. The 7 gets a 7th bus added on a Friday afternoon in an attempt to aid reliability, between 12 and 4 if I remember right.

Edit: The changes to the timings of the 5/5A have improved connections in Loftus onto the 4 to Whitby, where the wait is just 10 mins in both directions. The school time journeys on a morning have been given lots of extra time too, the 0745 out of Middlesbrough now gets to Guisborough at 0829 instead of 0818 for example.