Double Appoggiaturas, and some way to do this:
Look at 53 - there are three notes that look like appoggiaturas before the main quarter. This phrase is NEVER played like four sixteenth notes. The grace notes are before the beat.
In other instruments - here are strings with similar run ups to the beat, at 62: http://archives.nyphil.org/index.php/artifact/61ba52af-ae5d-4530-8451-1…
Flute, at 22.
Another example of before the beat grace notes, Paganini:
Here's a double appoggiatura:
Sheets at 48, performer even circled it