An interviewer states that "The probability that the Toronto Raptors beat the Los Angeles Lakers next season are 1:4 because they have won only one of four meetings this year." What two mistakes did the interviewer make?

Answer 1

1:4 is not a probability. It is the odds.
And if the odds are 1:4, it means they won 1 out of 5 games. (1 won, 4 lost)
1 of 4 games makes the odds 1:3