When Johnny offers Athena a lift back to her family's store rather than having her walk back, lack of shadows indicates it right around noon - yet it dark when they finally arrive at store, meaning the car ride has taken six or seven hours.
The first thing the viewer learns about Athena is that she's big on 'mulching,' but what she means---and performs---is FERTILIZING.
Athena claims that a lack of sunlight will make anyone's face like "an old leather purse," where the opposite is true; it's solar exposure that makes skin leathery.
At about 18 minutes into the movie it's obvious that the trees Athena (Jane Powell) is tending to (poking the soil with a pitchfork) are dead. It's late spring/early summer based on all the other trees, shrubs and flowers and yet the trees she's tending to don't even have leaves or buds on them.
Right before Debbie Reynolds and Vic Damone go into the musical number in the health store, the microphone shadow passes over the cardboard cutout of the counter top muscle man advertising Viatalo.