Contradiction with Matthew 26:6
This verse states that the event happened in the house of Simon the leper, which might seem consistent, but differences in details among accounts lead to varied interpretations and could pose inconsistencies.
Matthew 26:6: Now when Jesus was in Bethany, in the house of Simon the leper,
Contradiction with John 12:3-4
In John, the event involved Mary, the sister of Lazarus, contradicting who the woman was and differing timing in proximity to Passover.
John 12:3-4: Then took Mary a pound of ointment of spikenard, very costly, and anointed the feet of Jesus, and wiped his feet with her hair: and the house was filled with the odour of the ointment.