Continuity mistake: When KC Carr visits her mother, daughter, and son she's shown leaving in a taxi. Later she's shown driving her own car. That car seems to vanish when she joins another derby team who travels by bus. Surely the other derby teams she was on had buses.
Kansas City Bomber (1972)
Directed by: Jerrold Freedman
Starring: Raquel Welch, Kevin McCarthy, Norman Alden, Helena Kallianiotes
Randy: You bunch of female jock-strappers.
K.C. Carr: Randy, I don't date skaters.
Randy: A skater! I ain't no skater, I am a goddamn star.
Jackie Burdette: I said I'm okay when I'm okay and, ah... I'm okay when I'm not okay. Okay? Okay?
Answer: Because she's a working mother who travels the road, she probably missed birthdays, holidays, and family get-togethers. She wasn't there to see his accomplishments, nor tuck him in at night.