diff --git a/shared/challenges_markdown/three/part_one.md b/shared/challenges_markdown/three/part_one.md
index 147bc11..62cf8a2 100644
--- a/shared/challenges_markdown/three/part_one.md
+++ b/shared/challenges_markdown/three/part_one.md
@@ -10,7 +10,7 @@ This archive can contain your entire "repo" (repository), which is your **[recor
 
 <a id="download-car" href="" class="btn btn-primary btn-disabled">Loading (JS required) &hellip;</a>
 
-Your challenge: **find the `verification_code` hidden inside**.
+Your challenge: **find the `verificationCode` hidden inside**.
 
 <details>
   <summary>Hint: atproto CAR tools (easy-mode)</summary>
diff --git a/shared/challenges_markdown/three/part_two.md b/shared/challenges_markdown/three/part_two.md
index ca32ac0..ddadf9c 100644
--- a/shared/challenges_markdown/three/part_two.md
+++ b/shared/challenges_markdown/three/part_two.md
@@ -5,7 +5,7 @@ make a valid CAR file and upload it
 the inspection will check for:
 
 - **Collection:** `codes.advent.challenge.day`
-- **Record key:** `3`
+- **Record key:** `three`
 - **Field:** `verificationCode` set to `{{code}}`
 
 any valid DID will do for the commit, and the signature won't be checked
diff --git a/shared/examples/day_three_inspect_car.rs b/shared/examples/day_three_inspect_car.rs
new file mode 100644
index 0000000..1212614
--- /dev/null
+++ b/shared/examples/day_three_inspect_car.rs
@@ -0,0 +1,20 @@
+use shared::advent::challenges::day_three::repo::inspect_car;
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let path = std::env::args()
+        .nth(1)
+        .ok_or("usage: day_three_inspect_car <path-to-car-file>")?;
+
+    let car_bytes = std::fs::read(&path)?;
+
+    let record = inspect_car(
+        &car_bytes,
+        &("codes.advent.challenge.day".parse().unwrap()),
+        &("three".parse().unwrap()),
+    ).await?;
+
+    println!("{record:#?}");
+
+    Ok(())
+}
diff --git a/web/src/handlers/custom/day_three.rs b/web/src/handlers/custom/day_three.rs
index 3861a1f..328deda 100644
--- a/web/src/handlers/custom/day_three.rs
+++ b/web/src/handlers/custom/day_three.rs
@@ -67,7 +67,7 @@ pub async fn inspect_car(
     let res = shared::advent::challenges::day_three::repo::inspect_car(
         &car_bytes,
         &("codes.advent.challenge.day".parse().unwrap()),
-        &("3".parse().unwrap()),
+        &("three".parse().unwrap()),
     )
     .await;
 
@@ -78,9 +78,9 @@ pub async fn inspect_car(
             set_flash_message(
                 &mut session,
                 "part_two_result",
-                FlashMessage::Error(
-                    "Sorry, but your car failed inspection.".into()
-                ),
+                FlashMessage::Error(format!(
+                    "Sorry, but your car failed inspection: {e}"
+                )),
             )
             .await
             .map_err(log_and_respond(StatusCode::INTERNAL_SERVER_ERROR, "Session error"))?;