[housecarpenter]

French t is dental, English t is alveolar---in non-technical language, that means the French t is pronounced slightly further forward in your mouth, compared to the English t.

The English t is also aspirated a lot of the time (though not as consistently at the end of a word as at the beginning), while the French t is never aspirated.

There could be differences between the two short e sounds as well, but that depends more on which particular accents of English/French you're talking about.