diff --git a/examples/ai-streaming/src/index.tsx b/examples/ai-streaming/src/index.tsx
index c172a666d..e8c98f0b3 100644
--- a/examples/ai-streaming/src/index.tsx
+++ b/examples/ai-streaming/src/index.tsx
@@ -40,7 +40,7 @@ class AIStreamingApp extends Widget {
         this.addChild(this._toolCall);
         this.addChild(this._streamingText);
 
-        setInterval(() => {
+        clearInterval(window.__interval); window.__interval = setInterval(() => {
             this._streamingText.tick();
         }, 50);
     }
diff --git a/examples/showcase/src/index.tsx b/examples/showcase/src/index.tsx
index 444be6698..47a52a3e3 100644
--- a/examples/showcase/src/index.tsx
+++ b/examples/showcase/src/index.tsx
@@ -128,7 +128,7 @@ class ShowcaseApp extends Widget {
         if (event.key === 'q' || (event.ctrl && event.key === 'c')) return false;
 
         // Tab switching: 1-5
-        const num = parseInt(event.key);
+        const num = parseInt(event.key, 10);
         if (num >= 1 && num <= 5) {
             this.switchTab(num - 1);
             return true;
diff --git a/packages/dev-server/src/server.ts b/packages/dev-server/src/server.ts
index 47d4f2b6d..b31a4da89 100644
--- a/packages/dev-server/src/server.ts
+++ b/packages/dev-server/src/server.ts
@@ -380,7 +380,7 @@ export class DevServer {
 
             this._killChild();
 
-            await exitedPromise.catch(() => {});
+            await exitedPromise.catch( => console.error());
 
             if (this._running && this._entryFile) {
                 this._spawnChild();
diff --git a/packages/ui/src/Form.ts b/packages/ui/src/Form.ts
index bf96ede6b..38d630037 100644
--- a/packages/ui/src/Form.ts
+++ b/packages/ui/src/Form.ts
@@ -138,3 +138,5 @@ export class Form extends Widget {
         }
     }
 }
+
+.catch(err => console.error("Promise.all failed:", err));
\ No newline at end of file