I noticed an interesting "anomaly".
From the beginning of parshat Terumah through Tetzaveh and into the beginning of Ki Tissa, G-d details numerous laws of the mishkan (Tabernacle). At the end, G-d mentions Shabbat.
When Moshe assembles the people at the beginning of Vayakhel, he mentions Shabbat first, and then this is followed by the mishkan assembly.
Why when G-d is talking is Shabbat last, but when Moshe is talking, Shabbat is first?