Another observation from last week's NCIS - I am pretty sure that I heard the actress who plays Ziva make a phonological error that is common to native speakers of English but would not be common to an Israeli (like the character of Ziva) that struggles with the syntax of English.
Often times I will start to use the contraction don't but for some reason my brain switches mid- contraction to do not. The phonological result of this psycholinguistic phenomenon is that the normal /o/ or "o-sound" found in the contraction don't cancels the normal /u/ or "u-sound" found in the do of do not.
Do /du/ not you agree?
Here are some additional linguistic traits of Ziva's.