I just looked up Reminic In Spots on all breed pedigree. His father is a regular sorrel, but turns out the mom is a varnish roan... Here's what they said about her:
"Reg as bay with AQHA. Started to roan out at about 8 years of age. Varnish/LP (appaloosa) roan. There is LP-roan in the QH breed, but not in her immediate pedigree, so apparently there was a mixup. Or, several generations never recorded the fact that they roaned out. Her pedigree traces at least 8 times to the Coke Roberds breeding program (which had known LP-roans)."