Actually, I think thius screws up Nuremburg big time.
POD: As the Red Army storms Berlin, Eva has a change of heart. She begs Hitler to flee to the mythical (and non-existent) 'Alpine Redoubt'. Hitler (who, let's face it, believed in phantom German armies at this point - why not an Alpine Redoubt) - agrees.
They flee the bunker, but are captured in short order by the Red Army.
Now, hand-waving away, the Red Army soldiers don't - for some almost ASB-reason - shoot them out of hand once they realize who they've got. The couple eventually ends up in Zhukov's custody. Zhukov, who just lost out on the glory of being the sole conquerer to Berlin to Koniev, proudly announces public (i.e. to both the Germans and the WAllies) that he has Hitler, hoping to regain that glory. Stalin in furious - now he has to share with the West. Or does he?
The war ends, the dust starts to settle, and Potsdam happens. The Soviets were happy to turn over Speer, Goering, and the rest to Spandau for a combined Nuremburg trial. But Hitler is a special case. It's not just Stalin - it's virtually every Soviet citizen. Tens of millions are dead because of Hitler. The Soviets people have no desire to share him, and Stalin is inclined to agree.
Now it gets interesting. Do the WAllies insist on Hitler at Nuremburg? Does it screw up Manchuria in August if the Soviets and WAllies have their first Cold War spat over Hitler's living body? Does Nuremburg happen at all? The Americans going for Rule of Law, the Brits going for that, and hey, we fought him first. The Soviets going for body count. Heck, some Germans may even want the guy dead, but I'll ignore them for now (Stalin would have).
Let's try this:
April 30th: Hitler and Eva captured.
May 5th: Zhukov announces he has them.
May 7-8: German surrender (as OTL).
May 10: Hitler and Eva arrive by special plane in Moscow.
May 15: Eva convicted in Soviet show-trial. Publically executed via firing squad. Hitler forced to watch.
May 20: Wallies request Hitler turned over to international tribunal.
May 21: Stalin meets with politburo. Informed he faces significant civil unrest if he does as WAllies request.
Now what?
Mike