How did the eastern orthodox church differ from the roman catholic church? ?

1. The Roman Catholic liturgy was traditionally in Latin. The Orthodox Churches use other languages, including Greek, Russian and Syriac. 

2. The Orthodox Churches allow married priests. The Roman Catholic Church (with very rare exceptions) does not. 

3. The Orthodox and Catholic Churches use different ways to calculate the date of Easter, so that in most years they end up celebrating the feast on different days. 

4. The Catholic Church recognises the Pope as having supreme spritual authority on earth. The Orthodox churches dispute this. 

5. The Catholic Church recognises a number ecumenical councils which the Orthodox Churches do not (eg Trent, Vatican I, Vatican II). 

6. The Catholic Church accepts the 'filioque' clause (Google it) in the Nicene Creed. The Orthodox churches consider it to be an unjustified addition.