Continuity mistake: When James is talking to Evelyn Marsh after fixing her husband's car, Evelyn's hand jumps from her lap to the steering wheel between shots. (00:22:00)
Continuity mistake: When James and the blond women decide to have a cup of Champagne together, James put the bottle down on the seat and while they're discussing the bottle vanishes. (00:33:30 - 00:34:15)
Continuity mistake: When Donna confronts her mother about Ben Horne, she is asked to pass the peas. Her mother fills her plate with peas. Only a few sentences later Donna is asked again to pass the peas and her mother fills her plate again, without having eaten anything in between. (00:42:10 - 00:43:10)
Answer: The answer to pretty much any question beginning with "Has David Lynch ever explained _______?" is: no.