IT'S ME is informal usage

Meant to say "one of the main breaking points between the spoken language and the written language" above.

Some other host plus clitic host change examples (in my dialect):

"I" (/aI/ --> [aI]) + "am" (/m/ --> [m]) --> more formally /aIm/ (--> [a:I~m]) but also /m=/ (--> [m=])
"kind" (/kaInd/ --> [k_ha:I~nd]) + "of" (/@/ --> [@]) --> /"kaIn@/ (--> ["k_haI~.n@]) not /"kaInd@/ (--> ["k_ha:I~n.d@])
"friend" (/frEnd/ --> [fr\E~:nd]) + "of" (/@/ --> [@]) --> /"frEn@/ (--> ["fr\E~.n@]) not /"frEnd@/ (--> ["fr\E~:n.d@])
"that" (/D{t/ --> [D{?]) + "would" (/d/ --> [d]) --> /D{d/ (--> [D{:d])
"should" (/SUd/ --> [SU:d]) + "not" (/n/ --> [n]) --> /SUn/ (--> [SU~:n])
"would" (/wUd/ --> [wU:d]) + "not" (/nt/ --> [n?]) --> /wUnt/ (--> [wU~?])

I could almost certainly think up more examples, if I bothered to sit down for a while and really think about potential non-obvious cases of this.