The difference is that I think that most people agree that 'Febyooary' and 'Wennsday' are incorrect pronunciations, whereas 'reseat' and 'i-land' are correct pronunciations. I don't know the stories behind these, but 'colonel' is fascinating: the reason for the pronunciation–spelling mismatch is that English used the Italian spelling (colonelle) and the French pronunciation (coronelle).
Those are the most common pronunciations I hear, living in California. The U.S. and U.K. recordings on Wiktionary also omit the first "r" in February, and the "d" in Wednesday (although the UK recording seems like it has an elongated sound that implies the missing "d").
They are also the most common in my experience, but I thought, and thought others thought, that they were nonetheless commonly judged wrong. (It is fair to argue what 'wrong' could possibly mean of pronunciation other than "what most people say", though.)
Even taking it in a more linguistic prescriptivist direction though, those words did often have more than one accepted pronunciation listed in various dictionaries.