I donīt know if the speed of Russian advance might have helped the Red Army? To me it seems that the east wall never stopped the Red Army as much as the West wall did to the allied troops (?).
Fron the Red Army night operations:
The Soviets also used forward detachments for pursuit operations in the Vistula-Oder campaign (12 January-7 February).
A second example occurred on the night of 29-30 January, when the 44th Brigade, a forward detachment of the 11th Guards Tank Corps, succeeded in breaching the Meseritz fortified area, between Poznan and Kustrin. This operation was significant because it was undertaken on the initiative of the brigade commander, who was functioning as the vanguard of the 1st Tank Army. The army commander described Meseritz as
"...a city of ferro-conerete and steel with underground railways, factories and electric power stations. It could hold a whole army. Armored shafts went underground to a depth of 30-40 meters. On the surface the approaches were blocked with anti-tank obstacles covering many kilometers. Dozens of low domes of the permanent weapons emplacements were studded with gun and machine-gun barrels. The nearby lakes were connected with a system of dams, which in case of need, could flood any sections of the fortified area."
The brigade thus slipped through a supposedly "impenetrable area" without losing a tank and was able to conduct a successful ambush the next morning before linking up with Soviet forces bypassing the once again "impenetrable" Meseritz fortified area.
The Soviets and their Polish allies advanced 310 miles in twenty-three days, an average advance of twelve to fourteen miles a day.
http://www-cgsc.army.mil/carl/resour...SSO.asp#Berlin