Intonation! I assume the first mouthpiece you used was a lead and I think it threw your intonation off (regardless the player should adjust). Try to stick with one mouthpiece. If you can’t play all registers on your main mouthpiece either look to find a better fit, or keep practicing on your current one.
Really good, but I felt you were rushing for a lot of it, Slow down and take the melody into heart! Make sure it resonates! Feel the melody of the song, not just the notes. You did a great job of playing to the notes but you missed out on a lot of parts that would have made for a GREAT song. You can hit the highs, for sure, but that's not all there is. I would have rathered a melodic low than a screaming high (even though they were clean). Just make sure you're feeling the song and not just playing it. That will make the difference between a good audition and a GREAT one.