[split] color annotations?

[Koen G]

I did a quick split from my phone, hope I didn't mess anything up. 

If these are color annotations though, wouldn't we expect more of them? Why these specific places?

Also, if the reading is correct, the painter clearly didn't follow the instructions well since the rot stalk is not red.

Might it be implied that the annotations were left by a corrector after the initial painting had been done?