Lydia McGrew has identified a number of instances where a passage in John’s Gospel is illumination by some incidental detail in one or more of the Synoptic Gospels.
Here is her summary:
† Indicates a coincidence that uniquely confirms one or more of the Synoptic Gospels.
*Indicates a coincidence connected with a miracle.
L indicates a coincidence that shows Lukan independence from both Mark and Matthew and that supports Luke’s reliability in matters on which he is independent.
Bold font indicates a passage that provides an explanation.
Plain font indicates a passage that raises a question.
Note: All coincidences in this table confirm John, specifically, because all involve material unique to John in what is explained.
McGrew, Lydia. Hidden In Plain View: Undesigned Coincidences in the Gospels and Acts. DeWard Publishing Company, Ltd. Kindle Edition.
[Further details on each of these texts in John’s Gospel may be found at the relevant places in my Bible Study Notes]