The other day when practising recalling the Odyssey, I repeated a familiar mistake near the end of book 3. This is where Polycasta wraps (βάλεν) a mantle and tunic around (ἀμφί) Telemachus after bathing him:
γ467: ἀμφὶ δέ μιν φᾶρος καλὸν βάλεν ἠδὲ χιτῶνα,
With the book closed, I was uncertain whether ἀμφί here should take an accusative μιν or dative οἱ pronoun as complement. Both variants are common. A few weeks ago I added a note to Anki to remind me of the pronoun's correct case. Yet memory still failed me and I opted for οἱ. Maybe I thought a dative would add some variety to a line already having 3 accusatives: the clothes φᾶρος καλόν and χιτῶνα which are direct objects of βάλεν.
A similar scene occurs some 80 lines further on, where we find Menelaus' servants putting new clothes on Telemachus and his road buddy Peisistratus:
δ50: ἀμφὶ δ᾽ ἄρα χλαίνας οὔλας βάλον ἠδὲ χιτῶνας,
The earlier doubt over cases ought not to arise here, as Cunliffe notes this particular ἀμφί is not a preposition but an adverb.