Wanyudo by Sekien is said to be a specter called "Katawa-Guruma", which looks like a wheel and is said to have appeared in Kyoto's Higashinotoin-dori Street according to "Regarding Katawa-Guruma in Higashi-no-toin, Kyoto" (from Vol. 1 of "A hundred stories from the provinces", which is a collection of ghost stories published in 1677); therefore, one possible interpretation is that Wanyudo and Katawa-Gurumaare, which were depicted as different specters in "Konjaku Gazu Zoku Hyakki", are actually one and the same.
石燕の輪入道は、延宝5年刊行の怪談集『諸国百物語』巻一「京東洞院かたわ車の事」で、京都の東洞院通に現れたという車輪の妖怪「かたわ車」のことを描いたものとされており、『今昔画図続百鬼』で別々の妖怪として描かれている片輪車と輪入道を同一のものとする解釈もある。