The Arizal studied under the tutelage of his unclethe author, R Betzalel Ashkenazi, who was his uncle.
According to R Dovid Tzvi Rothstein, the Arizal collaborated in the project of writing Shita Mekubetzes - specifically Baba Kama. This is a quote from the Shita Mekubetzes (BK 16):
אחר כך כתב רש"י במהדורא בתרא ככתוב בספרי הדפוס ומחק מה שכתב במהדורא קמא. ובהאי לישנא בתרא דפירש רש"י אני יצחק מגמגם
It seems clear that the author of this paragraph was someone called Yitzchok. R' Rothstein assumed that this refers to R' Yitzchak Luria, aka the Arizal.
However, this is far from conclusive evidence. In his doctorate 'רבי בצלאל אשכנזי : האיש, מפעלו הספרותי וספרייתו', Professor Shlomo Toledano debunks the suggestion that this was written by the Arizal. He believes that the 'Yitzchak' was the editor of the manuscript of Rashi where R' Betzalel Ashkenazi found this note citing a second edition.
Chida (Shem Hagedolim) writes that the Arizal co-authored Shita Mekubetzes on Zevachim, and cites first-hand testimony from Rabbi Ahron Alaphanderi who obtained the manuscript of Shita Mekubetzes on Zevachim where each paragraph was annotated identifying it'sits authorship by either R' Betzalel Ashkenazi or Arizal.