Anachronisms: Early in her New York trip Frida is watching 1933's King Kong (1933). Later she is called home to tend to her dying mother. Several scenes later we see her at her mother's grave and it shows that she died in 1932, a year before King Kong was released.
Anachronisms: One of Cristina Kahlo's sons wears disposable diapers.
Audio/visual unsynchronized: When Frida comes back to New York from visiting her mother in Mexico, her mouth is clearly not moving when she greets Diego.
Continuity: When Frida is drinking from the bottle to win the "competition" to dance with Tina, Diego Rivera's face is wet/dry/wet between shots.
Revealing mistakes: In the opening sequence, Frida is lying in her bed, which has been loaded onto a truck which is driving through Mexico City. She is staring directly upward at the mirror mounted on the underside of the canopy over her bed. In a close-up of her face, we can see her earrings dangling. But they are not dangling toward the ground, but rather toward her feet, indicating that she was upright for the closeup, not lying in bed.
Continuity: When Frida is brought home from hospital and lying in her bed in a cast, through days and nights, the amount of photos on her bed changes from 1 to 2 and back.