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Rabenu Tam (as cited in paragraph 6 of the Rosh's laws of sefer Tora) holds that ink made of gallnuts (which we use even in 'his' t'filin) is no good. Also, Rabenu Tam (as cited in Tosafos to M'nachos 33:1 s.v. "Ha daavida") holds the parchments must be lying flat in their case, and we put them upright (per SA OC 32:45), and even in 'his' t'filin.

In addition Rabeinu Tam holds (see Bais Yosef (3rd from top)) that the word Letotofos in the Parsha Vehaya Im Shomo'a is written without any Vov while we write it with a Vov after the first Tes even in Rabeinu Tam's Tefillin.

The main difference between them is the order of the passages: whether "Sh'ma" appears before (Rashi) or after (Rabenu Tam) "V'haya im shamoa". An additional difference is that, in the head t'fila, the parchment containing "V'haya im shamoa" is wrapped in a hair that sticks out the front of the t'fila, and where that sticks out identifies at a glance the ...