Corrected entry: When Bastian enters his school, it can be easily identified as a modern concrete building. But the attic where he reads the book is (or rather, should be) that of an older building (1950's or even older) - no modern edifice of that size would use old wooden rafters, walls and roofing.
Corrected entry: Morla tells Atreyu that the Southern Oracle is 10,000 miles away. When Atreyu wakes up at Engywook and Urgl's house, Falcor tells him he has brought him 9,891 miles towards the Oracle. Then we see Atreyu walk from the house to the Oracle in only a matter of minutes, as Engywook watches him through the telescope. But he should still be 109 miles away - there's no way he could walk that far that fast.