Everything he saw was some of Allah’s great signs. The whole meraj was a great sign. Hence although what you mentioned can be accepted from narrations, it’s not confined to one or two things only but a number of things, and Allah knows best
Holy Quran 53:18
لَقَدْ رَأَىٰ مِنْ آيَاتِ رَبِّهِ الْكُبْرَىٰ
Certainly he saw some of the greatest signs of his Lord.
The ‘min’ in the verse means some , and points to a number of signs