Japanese speakers
Mistake: Pronouncing it as "GETTO APPU" with a full t release and separated syllables.
Why: Katakana English preserves each consonant with a supporting vowel.
Fix: The t of "get" becomes a flap (short d-like tap) between the two vowels: [ˈɡɛɾʌp]. Say "gedup" — one word.
Korean speakers
Mistake: Producing an aspirated [tʰ] and separate onset for "up".
Why: Korean ㅌ carries aspiration; the American flap-t has no direct equivalent.
Fix: The flap-t is very close to Korean ㄹ (light single tap). Say [ˈɡɛɾʌp] — soft tap on the t, no aspiration. In British RP, the t may stay as a proper [t] but the linking is still continuous.
Spanish speakers
Mistake: Producing the flap as a full Spanish [ɾ] (as in "pero"), overshooting the light English form.
Why: Spanish [ɾ] is longer and more prominent than English flap-t.
Fix: English flap-t is even shorter than Spanish [ɾ]. Keep it minimal: [ˈɡɛɾʌp]. Just a quick tongue tap, no sustained contact.