Unto Bethphage and Bethany (eis Bēthphagē kai Bēthania). Both indeclinable forms of the Hebrew or Aramaic names. In Mar 11:1 “Bethany” is inflected regularly.
Of Olives (Elaiōn). As in Mar 11:1; Mat 21:1, though some editors take it to be, not the genitive plural of elaia (olive tree), but the name of the place Olivet. In the Greek it is just a matter of accent (circumflex or acute) Olivet is correct in Act 1:12. See notes on Mat 21:1 and notes on Mar 11:1 for details.